The rpm.livna.org mirrors still work and yum will automatically use one of them. You can find the release-rpm on mirrors like the one on http://ftp-stud.fht-esslingen.de/pub/Mirrors/ in case you need it for a fresh Fedora install.
Update: The DNS for livna.org will likely be unavailable for at least a few days, likely a week or more. So spread the news to make sure everyone is aware of the fact that rpm.linva.org is still alive and remains usable thanks to the mirrors.
Update2: Use this command to enable livna on a fresh install:
su -c 'rpm -Uvh http://ftp-stud.fht-esslingen.de/pub/Mirrors/rpm.livna.org/livna-release.rpm'After that adjust the repo file to let it retrieve the mirrorlist from one of the mirrors:
su -c "sed -i 's|http://rpm.livna.org/mirrorlist|http://ftp-stud.fht-esslingen.de/pub/Mirrors/rpm.livna.org/mirrorlist|' /etc/yum.repos.d/livna.repo"The latter command should be used as workaround on exiting Fedora install as well if yum is unable to retrieve the mirrorlist!